A 50-26 win at Manchester saw Blackburn finish second as Lymm took the title on points difference.
Tom Lavelle, Tom Burtonwood, with two, Josh Jarrold, with two, Connor Scrivens, Jake Foster and Tom Mayoh were try scorers for the visitors. Leon Fifield slotted three conversions and Paddy Gaffy two. Manchester got Dough Day, Greg Stewart and Tom Travis over, with Day also adding a conversion and three penalties.